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Authorities are currently trying to remove the device from the sea before any ferries can leave British shores.

A 500m cordon is in place after the Second World War explosive was discovered during dredging work to make way for Royal Navy ships.

The discovery was made during work on the Royal Navy's new aircraft carriers.

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The discovery was made during dredging work to clear space for Royal Navy ships

Ferries trying to leave to cross the Channel have been told they cannot set off until the device has been dealt with.

Boats trying to enter the harbour have also been kept out at sea.

The device must first be removed from the sea before being safely detonated on land.

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Ferries have been halted from crossing the Channel

Several sites in the city, including Portsmouth Historic Dockyard, have been closed.

A Royal Nacy spokesman said: "Another German unexploded bomb has been found in Portsmouth Harbour.

"A plan is in place to tow the bomb out of the harbour, where it will be destroyed in open waters by RN bomb disposal experts.

Royal Navy photo competition winners 2016

Tue, June 7, 2016

Breathtaking images issued by the Ministry of Defence of the Peregrine Trophy awards 2016
Will Haigh won Royal Navy Photographer of the Year 2016
Simmo Simpson won Best Maritime Image Award
Jamie Weller won Royal Navy Amateur Maritime Image Award
Joel Rouse won People's Choice Award